Haloaralkyl biguanides



3,l$3,23@ Patented May ll, 1965 United States Patent "ice 3 230 April 19, 19 49, and British Patent No. 577, 843 to Qurd HALOARALkYfI BIGUANHDES and Rose, but none 15 said to have germicidal activity. Seymour L Shapiro, Hastings on Hudsml, Elm-mm it will be noted that the Rose of Patents Nos. 2,467,371 Shapiro, u-i f id Seymour 1,, Shapiro, and Bruush 577,843 15 the same Rose who was c-o-mdeceased, and Louis Freedman, Bronxviile, N.Y., 5 ventor of the bis-biguanide Patents Nos. 2,684,924 and assignors to US. Vitamin 8: Pharmaceutical Corpora- 2,863,919 and who co-authored the article on Hibit-ane New .Ymk, N'Y'! a corporation of Delaware referred to above. Although these patents do not indi- No Drawing Fllqd 1961 93,097 cate that the biguanides they describe have bactericidal 18 Clmms' (CL 260-244) or antimicrobial properties, they do have very broad dis- This invention relates to ha'loaralkyl biguanides, to a closures of utility, and recite a. variet f u for the Process p p g Such biguanides, t0 a t miel iel mono-biguanides, among them, utility as pharmaceuticals compositions comprising such biguanides and to .a procor chemotherapeutic agents, and as intermediates in the 5515 Di Icomljalfling microbes y use Of Such b'igllanidespreparation of chemotherapeutic agents, textile agents, Davies, Francis, Martin, Rose and Swain, in the Britdyestuffs, insecticides, rubber chemicals, plastics, resins ish Journal of Pharmacology 9, 1926 (1954), reported and the like. a series of bis biguanides that displayed a wide range Against this background, the development of the bisof antibacterial action against gram-posit=ive and grambiguanides is seen as a successful effort to increase the negative bacteria, but only a feeble action against spores. bactericidal activity of the mono-biguanides by doubling The best of this series of compounds was said to be the number of biguan-ide units in the molecule. The Hibitane, which has the chemical configuration: 20 patent literature does not show that the known substituent NE NH 11 n 'Hibitane is now available commercially, not only in 2 Great Britain where it originated, but also in the United States, under the name Chlorhexidine. These and additional bis-tbiguani-des wherein the chlorine on the phenyl determined that mono-biguanides having at least one halogroup is replaced by other halogen or by :allryl, alkoxy aralkyl group attached to the N or N terminal nitrogen or nitro groups, and the phenyl is attached directly or atoms, and having attached to the other terminal nitrogen through an alkylene group to the biguanide nucleus, are another haloaralkyl group or an aralkyl group, the said described in US. Patents Nos. 2,684,924 to Rose and groups having from about seven to about eighteen carbon Swain, patented July 27, 1954, and 2,683,919 to Biriatoms, display exceptional antimicrobial activity. Prefwell and :Rose, patented December 9, 1958. The ethyl erably, the haloaralkyl and aralkyl groups have from ene bis aryl biguanides are described in U.S. Patent No. seven to about fourteen carbon atoms. One haloaralkyl 2,690,455 to Kaiser et al., dated September 28, 1954,, or aralkyl group attached to each terminal nitrogen atom and are not said to have germicidal properties. as stated is sufficient, but, if desired, additional halo- Since that time a large number of reports have aparalkyl or aralkyl groups can be attached to one or both peared in the literature, describing the activity and cliniof these nitrogen atoms up to a total of four such groups, cal properties of the bisabiguanide germicides. These re- 4 preferably two or three. Any remaining positions at these ports are summarized by Lawrence in the J. Am. Pharm. nitrogen atoms not so substituted are'taken up by hydro- Assn, 49, 731 (1960). However, he notes that the bisgen or another organic radical having from one to about biguanides have several disadvantages. Hibi-tane and ix carbon m preferably m one to three, n analogous compounds are highly insoluble in water. The t d fr m the group consisting of alkyl, alkenyl and diacetate salt has a solubility in water of only approxi- 4 cycloalkyl radicalsmately 1.9%, and the dihydrochloride has a solubility By the term haloarelkyl is meant y g up of t of only 0.06%. Moreover, Hibitane is reduced in antiform microbial activity by organic substances, such as milk, blood, pus, etc., as also are a number of other commonly used germicides, Ca'lman and Murray, Brit. Med J. 2, 200 (1955).

Prior to the development of the bis-biguanides, it was groups on the biguanide nucleus increase germicidal activity .to any degree.

In accordance with the instant invention, it has been Aryl-alky1ene Halo represents halogen, and n is an integer from one to three, and preferably from one or two. Alkylene I r is a straight or branched chain hydrocarbon which links ggfwg gfi gafig? ig' iz gi iggggi fi' the haloaryl group to the biguanide nucleus. The alkyl- 3 2 157 that P y g de was a h; one group may itself include as substituents alkyl, aryl and bacteriostatic against streptococci, but only weakly so g glg gfig g ggs gi i gg fz g 23 :35; against staphylococci and grame-negative bacteria. Sirsi, a d 1k 1 g y me are Rao and De in Current Science (India) 19 317-1 8 pemrre a Yemegroups' represents a.mono Showed that N1 p ch10ro apheny1 N5H(, chloro or poly carbocychc or heterocychc aryl nucleus, mclud. q 5 y biguanide acetate had a moderate bacterim mg mixed carbocychc-heterocyclic poly nuclei, such as static activity against Staphylococcus aurcus (1150,000), m sin, ,2313%gs fg lag g gi a g 5 22 2 form Streptococcus pyogenes (1250,000), Salmonella typhosa y y gr P (1:50,000), S. paratyphi (less than 1150,000), Shigella Aryl-alkyleneparadysenteriae (less than 1250,000), Shigella dysenteriae (R9,,

5 2 8 2 55 232) ti Allcylene represents a straight or branched chain hy- H th -b 0 v 1 b i drocarbon group, which may itself include as substituents Y l lglliam B5 E111 fB-Ot Consldelia 37 more one or more alkyl, aryl, or cycloalkyl groups, and which actgg1 than d t d Us P links the aralkyl group to the biguanide nucleus. Meth- N 2 252 2 6 llgllanl 65 reP0r e m 34611115 ylene and ethylene are preferred alkylene groups. R is 9 and 2,455,897 to gy, dated December selected from the group consisting of hydrogen, and alkyl, 7, 1948, and No. 2,467,371 to Curd and Rose dated aralkyl, alkaryl, aryl and alkoxy radicals having from one to about six carbon atoms. n is an integer from one to three, preferably from one to two. Aryl represents a mono or poly carbocyclic or heterocyclic aryl nucleus, including mixed carbocyclic-heterocyclic poly nuclei, such as indano. Phenyl is preferred as the aryl nucleus. Aralkyl also includes aryl-heterocyclic poly nuclei in which R and R or R and R in the formula below are taken together as the alkylene group to form a heterocyclic ring, such as tetrahydroisoquinolino and isoindolino.

The biguanides of the instant invention can be defined by the following formula:

R1 2 3 4 5 R3 \I}TCNHCN/ Rg l IH IQH \R4 In the above formula at least one of R and R and one of R and R up to a total of four, are selected from the group consisting of haloaralkyl and aralkyl groups, at least one of R R R and R being a haloaralkyl group. The haloaralkyl and aralkyl groups have from about seven to about eighteen carbon atoms. The remaining Rs can be hydrogen, or another organic radical having from one to about five carbon atoms. When one of R and R and one of R and R is haloaralkyl, one or more of the remaining Rs can also be an alkyl or alkenyl radical having up to about five carbon atoms. It is preferred that at least one of the remaining Rs be hydrogen.

The halogen of the halogen-containing groups can be any of the halogen atoms, such as, for example, fluorine, chlorine, bromine or iodine. Chlorine is preferred.

Typical haloaralkyl radicals include 4-chlorobenzyl, 4 bromobenzyl, 4-fluorobenzyl, 4-iodobenzyl, 4-bromo-aphenylethyl, 3-chloro-a-phenylethyl, 2-chloro-fl-phenethyl, 2-bromobenzyl, 3,4-dichlorobenzyl, 2,4-dichlorobenzyl, 3,4,5-trichlorobenzyl, 2,4,5-trichlorobenzyl 2,5-dichlorobenzyl, 2,3-dichlorobenzyl, 2,3-dibromobenzyl, 2,4-diiodobenzyl, 4-iodo-a-phenylethyl, 2-chloro-S-bromobenzyl, 2,4-dibromobenzyl, 2,4,6-tribromobenzyl, 2,4,5tr-ich1orou-phenylethyl, 4-chloro-a-phenylpropyl, 3,4-diiodobenzyl, 3,4-dichloro p phenylpropyl, 4-chloro 'y phenylbutyl, ix-(p-chlorophenyl)-phenethyl, p-chlorobenzhydryl, B-(mbromophenyl)-phenethyl, 2,4-dichloro-a-phenylbutyl, and 3,4-diiodo-a-phenylbutyl.

Exemplary aralkyl radicals include benzyl, p-methylbenzyl, a-phenethyl, fl-phenethyl, a-methylphenethyl, uphenylphenethyl, B-phenethyl, benzhydryl and 1-indanyl.

Exemplary alkyl radicals include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, secondary butyl, amyl, isoamyl; hexyl, isohexyl, and secondary hexyl; typical alkenyl radicals include allyl and crotyl.

Preferably the alkyl and alkenyl groups have from one to three carbon atoms.

Typical aryl, alkoxyaryl, and alkaryl radicals include phenyl, diphenyl, naphthyl, furyl, thienyl, diphenyl, xylyl, methylphenyl; ethoxyphenyl dimethoxyphenyl, methoxyphenyl, diethoxyphenyl, tetramethoxyphenyl, ethylphenyl, and isohexylphenyl; typical cycloalkyl radicals include cyclopentyl, methyl cyclopentyl, cyclohexyl, methyl cyclohexyl, ethyl cyclohexyl and ethyl cyclopentyl.

Preferaby the aryl, alkoxylaryl, alkaryl and cycloalkyl radicals have from five to eight carbon atoms.

R and R or R and R when taken together as a single bivalent radical, each valence of which is connected to the nitrogen atom, form heterocyclic rings with the N or N nitrogen atom, such as isoindolino and tetrahydroisoquinolino.

The following haloaralkyl biguanides are exemplary of the invention. In the formulae as printed,

represent an aromatic carbocycl-ic ring, and

represent a staturated carbocyclic ring.

H NH

NH NH Ck Q NH H

ll NH H NE NH H NH 01- or-r,

N o-Nn-o-Nn on,-Oo1 01-64: n ILIH lhl 5 132 not accessible commercially can be prepared following the procedure by Shapiro et al., J. Am. Chem. Soc. 81: 3728 (19159). These include for example, N-methyl- 2,4-dichlorobenzylamine, N-methyl-3,4-dichlorobenzylamine, N benzyl 3,4 dichlorobcnzylamine, N benzyl- 2,4-dichlorobenzylamine and N-benzyl-3,4-dichlorobenzylamine. The Leuck-art Reaction (Org. Reactions V, p. 301) is employed for many of the other amines not commercially available.

New substituted dicyandiamides for use in the reac- Cl CH2 N11 10 2 tion were prepared following the procedure described by Shapiro et al. J. Am. Chem. Soc. 81: 4635 (1959). A The biguanides of the invention can be used as the free summary of their preparation and propertles is given base, but where water-solubility is a factor in their use, in the following table:

TABLE I Pero H N Dicyandiamide MJ? (@1113 Solvent Formula yie Calcd. Found Calcd. Found Calcd. Found C H CHCH NH(fiNI-IGN 12s-12s 59 Water G H zN4 C5H5CII2CHC:H3NHfi-NHCN 120-121 32 AcettgneonnnNruu 05.3 65.4 7 0 7.0 27.7 28.0

W8 61. NH

2-C1COH4OHz-NH(fi-NHCN HBO-183 72 Plgppanol- CnH ClNl.-. 51.8 52.4 4.4 4.6 26.9 26.5

exane. NH

4-o1ooHroHrNHfiNHoN 155156 77 do- C9HDC1N4 51.8 52.2 4.4 4.7 26.9 27.0

2,4-diClC HaCH NH-CNH-CN 198-202" 53 --.do GqHgOizN.-. 44.5 44.4 3.3 3.4 23.1 22.7

3,4(1iClCuH3CHz-NH(|INHCN 174 75 Water C9H5ClzN4... 44.5 44.2 3.3 3.4 23.1 22.9

they usually are employed in the form of their salts with The reaction of the dicyandiarnide and acid salt can the inorganic and organic acids such as mono and poly be conducted in the absence of a dispersant, but it is frecarbocyclic and sulfur-containing mono and poly aclds 4o quently advantageous to use an inert dispersant medium,

and acidic nitrogen compounds, since these salts are more soluble.

Such salts, which are formed from the corresponding acid (indicated by HX in the formula below), include the hydrochloride, hydrobromide, sulfate, phosphate, borate,

phosphite, sulfite, sulfonate, nitrite, carbonate, nitrate, a acetate, tartrate, propionate, oxalate, maleate, malate, picrate and B-ethoxypropionate, and the salts with acidic nitrogen compounds such as theophylline, substituted theophyllines and similar purines, saccharin, phthalimide, 5O

benzoxazine-2,4-dione and substituted benzoxazine-2,4- diones, N-p-methyl-benzenesulfonyl-N-n-butyl-urea, barbituric acid and substituted barbituric acids, and mercaptobenzothiazole, 8-chlorotl1eophylline, and succinimide. 5 The compounds of this invention are conveniently prepared by reaction of approximately equimolar quantities of the appropriately substituted dicyandiamide with an acid salt (preferably the hydrochloride) of the appropriately substituted amine, as illustrated by the follow ing equations:

Many of the required amine and dicyandiamide reactants are obtainable commercially. Amines which are 75 which can be a solvent such as Water or a non-solvent such as xylene or chlorobenzene. Whether a dispersant is used or not, the reaction mixture is heated at an elevated temperature, preferably at from about 110 to about 200 C., for a period of from 0.2 to about 2 hours. The higher the temperature, the shorter the reaction time. When a dispersant is used, the reaction temperature conveniently is the reflux temperature of the mixture. When no dispersant is used, the reactants can be heated above their fusion temperature. After a reaction period appropriate for the reaction temperature selected, the product is recovered by recrystallization.

If the amine salt is used as a starting material, the salt obtained of the biguanide is normall in pure form. It is possible to obtain the free base by adding one equivalent of alkali to the product in water or alcohol. The biguanide free base, in turn, can be isolated and purified or, upon reaction with one equivalent of a desired acid, converted to the salt of that acid which, in turn, can be purified.

Additionally, the more soluble salts such as the hydrochloride salts can be converted to more sparingly soluble salts, as, for example, the nitrate, by treating an aqueous solution of the hydrochloride with an excess of a salt of an alkali metal and the corresponding anion, such as sodium nitrate.

The following examples, in the opinion of the inventors, represent preferred embodiments of the invention:

Example 1 N (4. CHLORO e PHENETHYL) N (4 CHLORO- 3I%N1Z9Y)L)-BIGUANIDE HYDROCHLORIDE (COMPOUND An intimately ground mixture of 1.9 g. (0.01 mole) of p-chloro-/8-phenethylamine hydrochloride and 2.1 g. (0.01

1.5 mole) of 4-chlorobenzyldicyandiamide was heated for 1.75 hours, as the internal temperature was raised from 100 to 180 C. The product was cooled. After granulation under water, there was obtained by filtration 2.5 g. of product, which was recrystallized from propanolhexane; yield: 1.53 g. (38%), M.P. 165-168 C.

AnaIysis.-Calc. for C17H20C13N5: C, 51.0; H, 5.0. Found: C, 50.4; H, 4.7.

Example 2 Example 3 N (4 METHYLBENZYL) N (2,4 DICHLOROBEN ggL-BIGUANIDE HYDROCHLORIDE (COMPOUND NO.

BIGUAN- 23) An intimately ground mixture of 1.6 g. (0.01 mole) of p-methylbenzylamine hydrochloride and 2.4 g. (0.01 mole) of 2,4-dichlorobenzyldicyandiamide was heated over one hour as the internal temperature was raised from 159 to 173 C. After solution in 50 m1. of water, and cooling, there was obtained 4 g. of product which was recrystallized from propanol-hexane; yield: 3.1 g. (78%), M.P. 199-202 C.

Analysis.Calc. for C H Cl N C, 51.0; H, 5.0; N, 17.5. Found: C, 51.0; H, 5.1; N, 17.4.

Example 4 N (2 CHLOROBENZYL) N (2,4 DICHLOROBEN- )L)2)BIGUANIDE HYDROCHLORIDE (COMPOUND An intimately ground mixture of 1.8 g. (0.01 mole) of o-chlorobenzylamine hydrochloride and 2.4 g. (0.01 mole) of 2,4-dichlorobenzyldicyandiamide was heated over an interval of 20 minutes as the internal temperature was gradually raised from 143 to 169 C. The product was dissolved in 50 ml. of boiling water and when cool there was obtained 3.6 g. of product. After recrystallization from propanol-hexane, the yield was 2.85 g. (65% M.P. 209-210 C.

Analysis.Calc. for C H Cl N C, 45.6; H, 4.1; N, 16.6. Found: C, 45.4; H, 4.2; N, 16.9.

Example 5 N1 (4 CHLOROBENZYL) N5 (2,4 DICHLOROBEN- lZqlL)3-OB)IGUANIDE HYDROCHLORIDE (COMPOUND An intimately ground mixture of 1.8 g. (0.01 mole) of p-chlorobenzylamine hydrochloride, 2.4 g. (0.01 mole) of 2,4-dichlorobenzyldicyandiamide and 0.6 ml. of water was heated over a period of 30 minutes as the internal temperature was gradually raised from 138 to 160 C.

The cooled product was treated with 100 ml. of boiling water, and on cooling 3.5 g. of product was separated and recrystallized from propanol-hexane; yield: 2.91 g.

(70%), M.P. 187-188 C.

Analysis.-Calc. for C H Cl N C, 45.6; H, 4.1 N, 16.6. Found: C, 46.1; H, 3.9; N, 17.1.

The hydrochloride, upon solution in ethanol, treatment with an equivalent of sodium methoxide, filtration of sodium chloride, an evaporation of solvent, gave the biguanide free base. On treatment with equivalent quantities of mineral acids, or organic acids, the biguanide free base is converted to the corresponding salt.

16 Example 6 N (3,4 DIMETHYLBENZYL) N (2,4 DICHLORO- l%NgAZ)L)-BIGUANIDE HYDROCHLORIDE (COMPOUND An intimately ground mixture of 1.7 g. (0.01 mole) of 3,4-dimethylbenzylamine hydrochloride and 2.4 g. (0.01 mole) of 2,4-dichlorobenzyldicyandiamide was heated over one hour as the internal temperature was gradually raised from to 172 C. After treatment with 50 ml. of water and cooling, the product (4.1 g.) was recrystallized from propanol-hexane; yield: 3.18 g. (78%), M.P. 195-198 C.

Analysis.-Calc. for C H Cl N C, 52.1; H, 5.4; H, 5.2; N, 16.9. Found: C, 52.4; H, 5.2; N, 16.8.

Example 7 Example 8 N (3,4 DICHLOROBENZYL) N (2,4 DICHLORO- glgNgggLkBIGUANIDID HYDROCHLORIDE (COMPOUND An intimately ground mixture of 2.1 g. (0.01 mole) of 3,4-dichlorobenzylamine hydrochloride and 2.4 g. (0.01 mole) of 2,4-dichlorobenzyldicyandiamide was heated over a period of 30 minutes as the internal temperature was gradually raised from 149 to 162 C. The product was dissolved in 50 ml. of boiling water, and cooled. The 3.8 g. of product obtained was recrystallized from propanolhexane; yield: 3.5 g. (76%) of product, M.P. 233-237 C.

Analysis.Calc. for C H Cl N C, 42.2; H, 3.5; N, 15.4. Found: C, 42.1; H, 3.6; N, 15.7.

Example 9 N1 BENZYL N5 (3,4 DICHLOROBENZYL) BIGUAN- IDE HYDROCHLORIDE (COMPOUND NO. 52) An intimately ground mixture of 1.4 g. (0.01 mole) of benzylamine hydrochloride and 2.4 g. (0.01 mole) of 3,4-dich1orobenzyldicyandiamide was heated over a period of 30 minutes as the internal temperature was raised from 140 to 182 C. The product was treated with 50 ml. of

water and cooled. The 3.9 g. of crude product was recrystallized from propanol-hexane; yield: 2.74 g. (70%),

M.P. 163-164 C.

Analysis.Calc. for C ,,H CI N C, 49.7; H, 4.7; N,

18.1. Found: C, 49.4; H, 4.9; N, 17.6.

Example 10 N (4 BROMOBENZYL) N (3.4 DICHLOROBENZYL)- BIGUANIDE HYDROCHLORIDE (COMPOUND NO. 61)

An intimately ground mixture of 2.2 g. (0.01 mole) of p-bromobenzylamine hydrochloride and 2.4 g. (0.01 mole) of 3,4-dichlorobenzyldicyandiamide was heated for 1.5 hours as the internal temperature was raised from 140 to C. The product was cooled and dissolved in 50 ml. of boiling water. The product (2.17 g.) was recrystallized from propanol-hexane; yield: 1.48 g. (32%), M.P. 185-188 C.

Analysis.-Calc. for C H BrC1 N C, 41.3; H, 3.7; N, 15.0. Found: C, 41.6; H, 3.4; N, 15.8.

Example 11 N (3,4 DIMETHYLBENZYL) N (3,4 DICHLORO- I3N6Z3Y)L)-BIGUANIDE HYDROCHLORIDE (COMPOUND An intimately ground mixture of 1.7 g. (0.01 mole) of Example 12 N (3,4 DICHLOROBENZYL) N (3,4 DICHLORO- %I3Nggl)L)-BIGUANIDE HYDROCHLORIDE (COMPOUND An intimately ground mixture of 2.1 g. of 0.01 mole) of 3,4-dichlorobenzylamine hydrochloride and 2.4 g. (0.01

mole) of 3,4-dichlorobenzyldicyandiamide was heated perature was raised from 117 to 132 C. After solution in 50 ml. of boiling water and cooling, there was obtained 4.1 g. of product, which was recrystallized from propanolhexane; yield: 3.32 g. (76% M.P. 211-216 C.

over a period of 30 minutes While the internal temperature was raised from 130 to 160 C. The product was dissolved in 70 m1. of water, and when cool there was obtained 3.9 g. of product, which was recrystallized from propanol-hexane; yield: 3.35 g. (73%), M.P. 191192 C.

Analysis.Calc. for C H Cl N C, 42.4; H, 3.5; N, 15.4. Found: C, 42.5; H, 3.8; N, 14.8.

Example 13 N (1 INDANYL) N 3,4 DICHLOROBENZYL BL. GUANIDE HYDROCHLORIDE (COMPOUND NO. 65) An intimately ground mixture of 1.7 g. (0.01 mole) of l-aminoindane hydrochloride (the M.P. of the hydrochloride is 219-210 C.; the l-aminoindane was obtained from the Neville-Chemical Co., Pittsburgh 25, Pa.) and 2.4 g. (0.01 mole) of 3,4-dichlorobenzyldicyandiamide was heated for 1.5 hours as the temperature was gradually raised from 130 to 180 C. After cooling, the product was dissolved in 150 ml. of boiling water, and after cooling there was obtained 1.9 g. of crude product, which was recrystallized from propanol-hexane; yield: 1.73 g.

(42%), M.P. 215-217 C.

Analysis.-Calc. for C H Cl N C, 52.4; H, 4.9; N,

17.0. Found: C, 52.6; H, 5.2; N, 17.0.

Example 14 N -(fi-PHENE'IHYL)-N' -(3,4-DICHLOROBENZYL)-BIGUA- NIDE HYDROCHLORIDE (COMPOUND NO. 67)

An intimately ground mixture of 1.6 g. (0.01 mole) of fl-phenethylamine hydrochloride and 2.4 g. (0.01 mole) of 3,4-dichlorobenzyldicyandiamide suspended in 50 ml. of xylene was maintained in an oil bath with gradual increase of the internal temperature from 113 to 165 C. over a period of 40 minutes. The xylene was removed by distillation. The reaction product was cooled, and then recrystallized from 100 ml. of water; yield: 1.86 g. (47%), M.P. 165-170 C; I

Analysis.Calc. for C H CI N C, 51.0; H, 5.0; N, 17.5. Found: C, 50.9; H, 4.9; N, 16.9.

Example 15 N ,N -DIBENZYL-N (4-CHLOROBENZYL) -BIGUANIDE HYDROCHLORIDE (COMPOUND NO. 91)

An intimately ground mixture of 2.3 g. (0.01 mole) of dibenzylamine hydrochloride and 2.1 g. (0.01 mole) of 4-chlorobenzyldieyandiamide was heated over one hour as the internal temperature was raised from 122 to 182 C. Theproduct was cooled,'dissolved in 175 ml. of water and cooled. There was obtained 2.9 g. product, which recrystallized from propanol-hexane; yield: 2.43 g. (57%), M.P. ZOO-205 C.

Analysis.Calc. for C23H25Cl2N51 C, H, Found: C, 62.3; H, 6.7.

. Example 16 V N -(2 CHLOROBENZYL)-N METHYLN -(2,4-DICHLORO- 11 3Il(3)N%g2I;)-BIGUANIDE HYDROCHLORIDE (COMPOUND An intimately ground mixture of 1.9 g. (0.01 mole) of N-methyl-o-chlorobenzylamine hydrochloride and 2.4

Found Example 17 N (4 CHLOROBENZYL) N METHYL N (2,4-

DICHLOROBENZYL) BIGUANIDE HYDROCHLORIDE (COMPOUND NO. 103) An intimately ground mixture of 1.9 g. (0.01 mole) of Nmethyl-p-chlorobenzylamine hydrochloride and 2.4 g. (0.01 mole) of 2,4-dichlorobenzyldicyandiamide was heated in an oil bath over one'hour as the internal temperature was raised from to 156 C. Afiter treatment with 50 m1. of boiling water, and cooling, 3:8 g. of product was separated and recrystallized from propanol-hexane; yield: 2.5 g. (59%), M.P. 210-2l4 C.

Artalysia-Calc. tor C17H gC'l N Z C, 46.9; H, 4.4; N, 16.1. Found: C, 47.5; H, 4.4; N, 16.5. 3

Example 18 N ALLYL N (2,4 DICHLOROBENZYL) N5 3.4-

DICHLOROBENZYL) BIGUANIDE HYDROCHLORIDE (COMPOUND NO. 113) An intimately ground mixture of 2.5 g. (0.01 mole) of N-allyl(2,4-dichlorobenzyl) amine hydrochloride and 2.4 g. (0.01 mole) of 3,4-dichlorobenzyldicyandiamide was heated over one houras the temperature was gradually raised from 110 to 160 C. After granulation under watenthere was obtained on filtration 2.4 g. of product, which was recrystallized from propanol-hexane; yield: 1.07 'g. (22%), M.P. 155-160" C. v

Analysis.Calc. for C H Cl N C, 46.0; H, 4.1; N,14.1. Found: C, 46.1; H, 4.2; N, 13.9.

Example 19 N1 (4 CHLOROBENZYL) N1 -METHYL N5 BENZYL- 1 I 1\ rETHYLBIGUANIDE NITRATE (COMPOUND NO. An intimately ground mixture of 1.9 g. (0.01 mole) of N-methyl-p-chlorobenzylamine hydrochloride and 1.9

g. (0.01 mole) of N-methylbenzyldicyandiamide was heated over one hour as the temperature was gradually raised from 11 6 to C. After treatment with 50 ml.

of boiling water, the product remained in solution. Upon treatment of the aqueous solution with 2.55 g. (0.03

mole) of sodium nitrate, 4.3 g. of product precipitated,

and was recrystallized from propanol-hexane; yield: 2.38

g. (58%), M.P. -185" C.

Analysis.Ca1c. fOr CmHzgClNgOgl C, H,

N, 20.7. Found: C, 52.5; H, 5.2; N, 20.7.

Example 20 N (a PHENYL B PHENETHYL) N5 (4 CHLORO- glgNgggm-BlGUANlDE HYDROCHLORIDE (COMPOUND An intimately. ground mixture of 2.3 g. (0.01 mole) of a-phenyl-B-phenethylamine hydrochloride and 2.0 g.

(0.01 mole) of 4-chlorobenzyldicyandiamide was heated over 1.5 hours as the temperature was gradually raised from 128 to 162 C. After granulation under Water, there was obtained on filtration 3.9 g. of product which was recrystallized from propanol-hexane; yield: 1.2 g.

(27%), M.P. 170172 C.

Arlalysis.Ca;lc. for C H Cl N C, 62.4; H, 5.7; N, 15.8. Found: C, 62.1; H, 6.1; N, 15.8.

Using the above procedures, any of the compounds listed in the table in columns 413 can be prepared. In this way, the compounds for which data is given in Tables II, III and IV were prepared.

The biguanides of this invention are extremely potent antimicrobial agents, for example, bacteriostatic, bactericidal, and fungistatic agents, when brought into contact with the microbes by any desired means, and have been 19 found to be effective against the important gram-positive and gram-negative bacteria and fungi at levels consistent with the highest activity demonstrated in in vitro tests with the most effective known antibiotics. This activity r 20 plates and tubes were included to make certain that the bacteria were not dying in the absence of the exposure to the biguanides and because of the experimental manipulations. The lowest concentration of biguanide in parts is particularly remarkable in that under conditions of reper million which prevented the appearance of visible peated transfer, no bacterial resistance is obtained even growth is the MIC. after as many as 25 transfers. Two methods were employed to demonstrate non- Data on the bactericidal and fungicidal and antimonilial development of resistance: (1) serial passage in the presproperties of a large number of compounds within the ence of gradually increasing concentrations of the drug invention is given in Tables II, III and IV. These data in nutrient broth flasks and (2) subculture of colonies are typical and attest to the effectiveness of these biguagrowing in the presence of the highest concentration of nides. The following test conditions were employed in the drug on a gradient plate. [W. Sybalski, Science 116: obtaining these data. 46 (1952).]

Bacteriostatic activity was established by spreading Activity of the biguanides in serum was demonstrated 100,000 bacterial cells on the surface of a petri plate conby the addition of serum to nutrient broth and to nutrient taining nutrient agar in which had been incorporated the agar. Controls were run to ascertain that the serum itparticular concentration of biguanide. A plate containing v self was not antibacterial under the conditions of the ex- 1.0 microgram of the biguanide per ml. of agar (1 part periments. The usual concentrations of biguanides and per million) for example, has 15 micrograms of the biguabacteria (as above) were added to the serum-containing nide added to a 15 ml. portion of melted nutrient agar, media, and after incubation the tubes and plates were mixed thoroughly, and the agar poured into the plate. examined for visible growth.

After incubation at 37 C. for 2 days, the plates were The antibiotic resistant strains of Staph. aureus were examined for visible colony growth. The minimum inshown to be resistant to the antibiotic, and responsive to hibitory concentration (M.I.C.) is the lowest concentrathe antimicrobial action of the biguanide, by the same tion of biguanide expressed in parts per million that pretype of petri plate test used for the bacteriostatic evaluavented completely the appearance of visible growth in this tion of the biguanides.

test. The results of the testing are shown in the tables. In

Fungistatic activity was assessed following the usual many instances the specific end point consistent with comprocedures employed by those skilled in this art. plete antimicrobial action was not obtained, but the ranges Bactericidal activity was determined by exposinga given shown are illustrative of the order of activity. Much concentration of cells such as 10 (other concentrations lower concentrations in many instances would be required give nearly identical results) to a given concentration of to partially inhibit the bacterial growth. The minimum biguanide in nutrient broth (or other media such as saline) inhibitory concentration, reflecting the test conditions emfor a period of 5 minutes (longer times give identical repl y is y r h mos S e riteria for evaluating sults; shorter times require slightly more biguanide) at a compounds in that it defines the complete destruction of temperature of 37 C. (other temperatures give identical every organism under the test condition. results). The number of bacteria that remained alive It will be noted that the bacteriostatic range reflects was determined by diluting the sample and spreading apa far higher degree of sensitivity of response for certain propriate dilutions on plain nutrient agar plates. The of the organisms as compared to others. However, withdilution dilutes the biguanide to levels far below the bac- 40 in the higher ranges, with, for example, Pseudomonas, an teriostatic level, and dilutes the bacterial sample so that organism which is unusually resistant towards antimicroisolated colonies can be obtained and counted. Control bial agents, bacteriostasis at 10-25 ppm. is a good result.

TABLE II Minimum inhibitory concentration (p.p.m.) Biguaulde Hydrochlonde S. aureus Nelsseria N -(benzyl)-N -(2,4-dichlorobenzy1) 1-10 1-3 N -(4-methylbenzyD-N (2,4-dichlorobenzyl) 1 1-3 N -(2 chlorobenzyD-N (2,4-dichlor0benzy1)- 0.3-1 1-3 N -(4-chlorobenzyl)N -(2,4-dichlorobenzyl) 0. 3-1 1 N1-(3 ,4-dimethy1benzyD-N (2,4-dich1orobenzyl) 1 1-3 N1,NB-di(2,4-dichlorobenzyl) 0. 3-1 0. 3-1 N -(3,4-dichlorobenzyl)-N -(2 ,4-dichlorobenzyl) 0. 3-1

N -(benzy1)-N -(3,4-dichlorobenzyl) 0. 3-1 0. 1-0. 3 N -(4-methy1benzy1)-N -(2-chlorobenzyl) 1 3, 3 1 3 3 N -(4-eh1orobenzyD-N -(2-ch1orobenzyl) 0.3-1 N -(3,4-dimethylbenzyl)-N -(2-chlorobenzyl) 1-3. 3 1-3. 3 N (3-4-dimethylbenzyl)-N -(4-chl0r0benzyl) 1-3. 3 0, 3-1 N -(4-methylbenzyD-N (4-chlorobenzyl) 1-3, 3 N -(4-br0mobenzyD-N (4-chlorobenzyl) 0. 3-1 N -(2-bromobenzyl)-N -(3,4-dichlor0benzy1) 0. 3-1 N -(3-bromobenzy1)-N -(3,4-dichlorobenzyl) 0. 3-1 1.(4-bromobenzyl)-N -(3,4-dich1orobenzy1) 0. 3-1 N -(2-bromo-l9-phenethyl)-N -(3,4-diehlorobenzyl) 0. 3-1 N -(4-bromo-fl-phenethyl)-N -(3,4-dieh1orobenzyl) 1-3. 3 N ,N -di(benzy1)-N -(4-nhlorobenzyl) 0. 3-1 1-3. 3 N -(Z-chlorobenzyl)-N -(methyl)-N --t- :hlorobe11zyl) 1-3. 3 1-3. 3 N -(4chlorobenzyl)-N -(methyl)-N 4-chlorobenzyl) 1-3, 3 1 3 3 N -(3,4-dich1orobenzyl)-N -(methy1)-N -(4-chlorobenzy1 1-3. 3 N -benzyl-N methyl-N -(2,4-dlchlorbenzyl) 1-3. 3 1-3. 3 N ,N -d1(benzy1)-N -(2,4-d1chlorobenzyl) 0. 1-0. 3 1-3. 3 N ,N-d1(2,4-dlchlorobenzyl)-N -(a11yl) 1-3. a 1-3. 3 N -benzy1-N -methy1-N -(3,4-d1ch1orobenzyl) 1-3. 3 N ,N -di(benzyl)-N -(3,4-dich1orobenzyl) 0. 3-1 1-3. 3 N -(4-cl1l0ro-fi-phenethy1)-N -(4-chlorobenzy1) 1-3. 3 0. 3-1 N -(2-t1uorobenzy1)-N -(2.4-dlchl0r0benzyl) 1-3. 3 N -(4-fluorobenzy1)-N -(2,4-d1ch1orobenzy1) 1-3. 3 1-3. 3 N -(2-bromobenzyl)-N-(2,4-dlchlorobenzyl) 1-3. 3 0. 3-1 N -(S-bromobenzyl)-N -(2,4-dtchlorobenzyl) 1-3. 3 0. 3-1 N -(4-bromobenzyl)-N -(2,4-d1ch1orobenzyl) 1- 3. 3 0. 3-1 N -(l-indanyl)-N -(2,4-dich1orobenzy1) 1-3. 3 1-3. 3 N -(2-chloro-fl-phenethyl)-N -(2,4-dichlorobenzyl) 1-3. 3 0. 3-1 N -(3-chloro-fl-phenethyl)-N -(2,4-dichlorobenzyl) 1-3. 3 N -(4-chloro-Bphenethyl)-N -(2,4-dlchlorobenzyl) 1-3.3

23 TABLE IVContinued Minimum inhibitory concentration (p.p.m.) Biguanide hydrochloride Peniclllium Momlz'a albicans benzyl). N -(a-phenyl-B-phenethyD-N -(3,4-

dichlorobenzyl).

d Slight growth Slight growth Slight growth 2,4-dichlorobenzyl.

As an example of the synergistic elfect obtained with mixtures of the compounds of this application, a mixture of 2.5 micrograms of each of N -(a-phenyl-p-phenethyl)- N -(4-chlorobenzyl)-biguanide hydrochloride, and N -(4- iodophenethyl) -N -(4-chlorobenzyl -biguanide hydrochoride (total dose 5 micrograms/ml), completely inhibited the growth of Monilia albz'cans, whereas each compound by itself required 7 micrograms/ml.

The coupling of antibacterial activity with antifungal activity, and particularly, antimonilial activity, greatly increases the versatility of the compounds of the invention. It is well known, for example, that in the course of antibiotic therapy, as the bacterial flora disappear under the influence of the antibiotic, the environment becomes much more favorable for the proliferation of fungus organisms, particularly Monilia albicans. The concomitant antimouilial and antibacterial activity of the com- 24 pounds of this invention suppresses overgrowth of Monilia under bacteria-free conditions.

It is also accepted that with continued use of antibiotics, many resistant bacterial strains have emerged. Certain strains of Staphylococcus aureus are at present a serious hazard, and there is a great need for suitable hygienic and therapeutic means to destroy such organisms. The compounds of this invention are effective against antibiotic-resistant S. aureus, and S. aureus are apparently unable to acquire resistance to the antimicrobial action of these bigu-anides.

Many antimicrobial substances are temperature-sensitive in conjunction with their antimicrobial activity, but the compounds of the invention are equally effective at temperatures extending from 2 to 45 C. at any pH in the range of from 5 to 10.

Additionally, the compounds of this invention are equally effective in their activity when the organism is in an aqueous medium, bacteriological nutrient medium or in serum. In the latter respect, these compounds differ significantly from the bis-biguanides, whose activity is reduced in serum.

The biguanide compounds of the invention can be employed in conjunction with other medicaments for specific purposes, according to the therapeutic effects required. Other medicaments which can be employed, in the form of compositions in which they are compatible with the biguanides, include the antihistamines; sulfa drugs, for example, sulfadiazine, sulfa-benzamide, sulfacetamide, sulfanilamide, sul-fapyridine, sulfathiazole, sulfapyrazine, sulfaguanidine, sulfaphthalidine, sulfasuxidine, sulfisoxazole, Sulfamylon, phthalylsulfacetamide, N'3,4-dimethylbenzoylsulfanilamide, benzylsulfanilamide and N'-2-(2- quinox-alyl) sulfanilamide; liptropic agents, such as methionine, choline, inositol and bet-a-sitosterol and mixtures thereof; stimulants of the central nervous system, for instance, caffeine and the amphetamines; local anesthetics, analgesics, such as aspirin, salicylamide, sodium gentisate, p-acetylaminophenol, phenactin and codeine; laxatives, such as phenolphthalein; sedatives, for example, barbiturates and bromides; salts of penicillin, such as potassium penicillin G, procaine, penicillin G, l-ephenamine penicillin G, dibenzylamine penicillin G, and other penicillin salts disclosed in U.S. Patent 2,627,491; phenoxymethylpenicillin and salts thereof; additional antibiotic agents, such as streptomycin, dihydrostreptomycin, bacitracin, polymixin, tyrothricin, erythromycin, chlortetracycline, oxytetracyoline, tetracycline, oleandomycin, chloramphenicol, magnamycin, novobiocin, cyclosterine and neomycin; vitamins, for instance, vitamins A, A B B B B and members of that family, folic acid and members of that family, and vitamins C, D D and E; hormones, such as cortisone, hydrocortisone, 9-a-fluorocortisone, 9-a-fluorohydrocortisone, prednisone and prednisolone; anabolic agents, such as 1l,17-dihydroxy-9-a-fluoro- 17-o-methyl-4-androsten-3-one and l7-u-ethylal9-nortestosterone; and additional antifungal agents, such as mycostatin.

The biguanides of the invention are suitable for oral administration as antibiotics, antibacterial and antifungal agents. For this purpose, the biguanides suitably are compounded with an excipient which is non-toxic, edible or potable, and chemically inert to the substituted biguanide salt. The proportion of the excipient should be at least suflicient to separate the particles of the biguanide from each other, and to cause quick solution or dispersion of the biguanide composition when contacted with the gastric juice of the stomach. When the excipient is a solid, the amount thereof may be from about 0.3 to about 5 parts for one part of the biguanide.

As solid excipients, lactose, sucrose, starch, pregelatinized starch, gum arabic, gum tragacanth and mixtures of these can be used. Suitably, the solid excipient may render soap germicidal.

25 contain also admixed magnesium stearate, talc, cornstarch, or two or more of these additives to promote separation of the composition from the plunger and mold used in shaping the composition into tablets for use orally.

BIGUAN-IDE TABLET Weight Approximate in mgs. percentage N ,N -di (3 ,4-dichlorobenzyl)-biguanide hydrochloride 100. 62. 0 Sucrose 25. 9 16.0 Starch 22. 1 13. 5 Acacia 7. 8 4. 5 Talc r 3.1 2.0 Magnesium stearate- 1. 5 1. 0 Stearic acid .e 1. 6 1.0

The biguanide of the above composition can be replaced by any of the other biguanides described and claimed herein, on an equal weight basis. The biguanides may be employed alone and in compatible admixtures when preparing various formulations.

In making the tablet, the biguanide is mixed with the sucrose and gum acacia, and then with starch made previously into a paste with a small amount of distilled water. This mixture is dried at low heat, and put through a granulator which converts it into a granular powder. This mix is then blended with the tale, magnesium stearate and the stearic acid which act as mold lubricants. The whole is now mixed in a pony mixer or other suitable powder mixing equipment, and then is ready for tabletting on any type of tablett-ing machine or for filling into hard gelatin capsules;

The biguanides can also becompounded in the form of solutions-and elixi-rs with-suitable solvents and dispersants, suehas is conventionally used in such formulations. Aqueous and alcoholic solutions usually are used, as is evident from the examples of cosmetic lotions and solutions which are given later. The amount of biguanide is not'critical, and is chosen to meet the need; usually, from 0.02 to about 15% is adequate.

These biguanides also are effective antibacterial agents for use in the preparation of germicidal soaps, in which environment they are not inactiviated by the soap, as are many. other germicidal agents such as the alkyl phenols. 'Only small amounts of the biguanides are required to An amount as low as 0.01% based on the weight of the soap produces a soap composition having excellent antibacterial potency, and in addition such a soap furnishes antifungal and antibiotic action. As much as 5% has been used to advantage. There is no need to employ more than is required to give the desired effect, and in general from 0.01 to about 1% is effective for most purposes, and is preferred.

The biguanide soaps in accordance with the invention can be formed as bar soaps, powdered soaps, chip soaps, flake soaps, bead soaps, bar and cake soaps and soap compositions intended for toilet, washing and disinfectant purposes, in addition to their use as detergents. The compositions can be dried in any desired way; spray drying is convenient in many instances. It is desirable to hold the temperature to which the mix is subjected during conversion into its final form below the temperature at which the biguanide would be decomposed. Soap mixtures in accordance with the invention have been subjected to temperatures up to 125 F. for periods of up to one hour without disadvantage.

In particular the soap compositions are desirably formulated to be at the pH range of from 7.0 to 7.5.

Those skilled in the art will perceive many variations in such soap compositions. For example, the biguanide need not be the only germicidal agent; other germicides, such as 2,2'-dihydroxy halogenated diphenyl methanes, can be included,-for example, if desired.

The soap compositions, in addition to the soap and germicide, will also usually contain fillers, coloring materials and perfumes, as desired, as is familiar to those skilled in the detergent art.

The compositions containing the biguanide may contain mixtures of detergents, such as soap and an anionic nonsoap, or soap and a cationic nonsoap, or soap and a nonionic nonsoap, or be composed wholly of nonsoaps, including the anionic, cationic, and nonionic synthetic detergents. Typical satisfactory anionic nonsoaps are the alkyl sulfates, such as sodium lauryl sulfate, known in the trade as Duponol C; the alkyl aryl sulfonates, such as sodium polypropylene benzene or toluene sulfonates and the sodium keryl benzene or toluene sulfonates; the sulfated ethoxynated phenols, such as the ammonium salt of sulfated ethoxynated nonyl phenol, prepared by condensation of nonyl phenol with five moles of ethyleneoxide; the sodium fatty acid esters of taurine, such as sodium palmitic or oleic methyl tauride or mixtures thereof; the esters of higher fatty acids and hydroxy ethane sulfonates, such as oleic acid ester of hydroxy ethane sodium sulfonate. Also useful are nonionic nonsoaps, such as the polyethylene glycol esters of the higher fatty acids, for example, polyoxyethylene ethylene and propylene glycol stearates; the polyethylene glycol ethers of alkyl phenols, such as the condensation product of octyl and nonyl phenol with five to twelve moles of ethylene oxide; the higher fatty acid esters of sorbitan-ethylene oxide condensates, such as sorbitan monostearate ester of polyoxyethylene glycol. They may be in any of the forms described heretofore, including cakes or powders, and may include various fillers, sudsing agents and ingredients conventionally employed in detergent formulations. They may be compounded for various purposes, such as for shampoo, dishwashing, textile laundering, toilet soaps and similar preparations. The biguanide may be included in compositions which contain soap or other surface active agents not intended primarily for detergent use, such as various powdered cosmetics.

The term soap as used herein refers to alkali metal soaps of the saturated and unsaturated higher fatty acids having from about eight to about twentysix carbon atoms, such as capric, caprylic, lauric, myristic, palmitic, stearic, oleic, linoleic, linolenic, arachidic, behenic, margarigtridechoic, and cerotic acids and the mixtures of such acids naturally occurring in fats, oils, waxes, and resins, such as the soaps of coconut oil fatty acids, tallow fatty acids, pig fat, fish oil fatty acids, beeswax, palm oil fatty acids, sesame oil fatty acids, peanut oil fatty acids, olive oil fatty acids, palm kernel oil fatty acids, corn oil fatty acids, babassu oil fatty acids, rosin acids, abietic acid, and greases.

The biguanide compounds ofthe invention are also useful in cosmetic and toilet preparations of all kinds, including, for example, cleansing creams and lotions, emollient creams and lotions, hand creams and lotions, hormone creams, suntan preparations, skin lighteners and bleaching creams, face powders, rouge, foundation makeups, lipsticks, eye makeups, dentifrices, mouth washes, shampoos, shaving soaps and creams, pre-shave and after-shave preparations, depilatories, bleaches, hair colorings and dye removers, wave sets, lacquers, rinses, and conditioners, hair grooming preparations, antidandruff preparations, bath preparations, eye lotions, nail lacquers, antiperspirants and deodorants, aerosol cosmetics, baby toiletries and hypoallergenic cosmetics.

All such preparations are of conventional formulation, employing a suspending or dispersing agent, a cosmetic base and other ingredients typicalof the cosmetic use desired. The biguanide is incorporated in these compositions, with the aid of additional dispersing or suspending agents, where required, to make a uniform composi- 27 tion in which the biguanide remains homogeneously distributed or dispersed.

Cleansing creams can be of the usual white, emulsified or cold cream type, frequently referred to as the beeswax-borax type cream, or of the translucent liquefying type, consisting of a mixture of hydrocarbon oils and waxes. The minimum basic ingredients required for a beeswax-borax emulsion type of cream are beeswax, mineral oil, borax and water. Spermaceti, cetyl alcohol, cocoa butter and vegetable oils can be incorporated as emollients. The translucent liquefying type of cream will include a physical mixture of mineral oil, parafiin, petrolatum and other waxes. Emollient ingredients can also be incorporated in this type of cream. The following are typical formulations for the beeswaxborax and liquefying cleansing creams contemplated by the invention:

Beeswax- Liquetyingborax, cleansing, percent per cent Beeswax Mineral oil Biguanide No.

The following is a further example of a cleansing cream:

Percent The following are examples of antimicrobial emollient creams:

Emollient creams, percent Part A:

Beeswax Petrolat Spermaceti Light miner Glyceryl monosterate, pure Lanolin Propyl paraben Biguanide N0. 52

Part B.

Methyl paraben Water... Perfume The above formulations will serve as lotion emulsions upon dilution with more of the solvent base, water in the case of an oil-in-water lotion, and oily components in the case of a water-in-oil emulsion.

The conventional hand cream formulation is a modified vanishing cream of the oil-in-water type, the basic composition being a stearic acid soap such as potassium stearate as the emulsifier, an excess of stearic acid, a humectant such as glycerol, and a high proportion of water. A hand lotion has a smaller proportion of solids, but is similar in formulation. Additional ingredients include barrier agents, emulsifiers, preservatives, perfume 28' oils and coloring agents. The following are typical hand cream and lotion formulations:

Cationicnonionie typ percent Anionic stearate Nonionie yp type, percent percent Part A:

Cetyl alcohol 2 Glyeeryl rnonostearate. 1 Isopropyl palmitate- Lauolin Mineral oil Polyethylene glycol 1000 monostearate Stearlc acid.

Part B:

Glycerol Methyl parabem Polyethylene glycol 300 monostearate Potassium hydroxide Sorbo (70% aqueous sorbit0l) Stearyl colamino iormyl mgthyl pyridinium chlo- Part 0:

Perfume and color Biguanide No. 38

Suntan preparations contain an active sunscreen as the principal active ingredient, and in addition can have any desired cosmetic base. Suntan preparations can be in the form of oils, jellies, creams, lotions and ointments. The following are typical lotion and cream preparations:

SUNTAN LOTION (ALCOHOLIC) Lipstick formulations are made up of a suitable combination of pigments and colors to give the desired mark and strain, incorporated into a base which will disperse them uniformly and will flow smoothly when molten, such as vegetable and mineral oils, fatty esters and polyalkylene glycols. Waxes are used to strengthen the stick and raise the melting point. The following are typical examples of lipstick formulations incorporating a biguanide of the invention for anti-bacterial and anti-microbial action:

A, percent B, percent Beeswax Ozokerite. Carnanba wax 8 Cercsin wax--- Lanolin Lanolin absorption base- Isopropyl myristate Color Antioxidant Perfume Biguanide No. 20 1 Dentifrices are made up in various forms including pastes, powders, liquids and sol-ids. Tooth powders contain an abrasive, a surface active agent, flavoring oils and sweetin g agents. Tooth pastes contain inaddition water, a humectant, a binder and a preservative. Typical abrasives include calcium carbonate, dibasic calcium phosphate dihydrate and hydrous dibasic calcium phosphate, tricalcium phosphate, calcium sulfate, calcium pyrophosphate, insoluble sodium metaphosphate and hydrated alumina. In addition to these ingredients, a dentifrice can include a fluoride toaid in prevention of caries. The following are typical examples of dentifrice powders and pastes in accordance with the invention:

Percent Insoluble sodium metaphosphate 26.6 Dicalcium phosphate 26.6 Gum 1.4 Flavor 1.6 Purified alkyl sulfate (sodium lauryl sulfate) 1.1 Glycerol and water 1 41.7 Biguanide No. 122 1 Parts Microcrystalline aluminum hydroxide 38.2 Aluminum hydroxide (325 mesh) 5.0 Sodium fluoride 0.1 Sodium alginate 1.0 Glycerol 15.3 Sorbo (70% aqueous sorbitol) 15.3 Water 19.8 Color 0.004 Saccharin, soluble -u 0.25 Flavor 1.2 Sodium lauryl sulfate 2.2 OrthophOsphoric acid to pH 7.3 0.6 Biguanide No. 122 1 Percent Insoluble sodium metaphosphate 75.8 Tricalcium phosphate 20.0 Alkyl sulfate (sodium lauryl sulfate) 1.0 Flavor 2.0

Saccharin 0.2 Biguanide No. 122 1 A mouthwash is usually prepared as a concentrate in the form of a solid or liquid composition which is diluted with water just before use, and incorporates water, an organic solvent such as ethyl alcohol, flavor and color. Astringent ingredients may be added for the purpose of flocculating and precipitating proteinaceous material. Buffers may be included to reduce stringy saliva, and deodorants and other therapeutic agents can also be added to relieve infection, prevent dental caries or other pathological conditions. The following is a typical example of a mouthwash:

Percent Anethole 0.500 Methyl salicylate 1.000 Menthol 0.250

Saccharin sodium 2.000 Propylene glycol 25.000 Glycerol 25.000 Tween 80 20.000 PD-& C Red No. 2 0.075

Ethyl alcohol 26.175 Biguanide No. 38 1 Shampoos are classifiable as liquid clear shampoos, liquid cream or cream lotion shampoos, CI'BELII]. paste shampoos, egg shampoos, herbal shampoos, dry shampoos, liquid dry shampoos, color shampoos and aerosol shampoos. Biguanides can be incorporated in any of these types of formulations to produce an antiseptic, antibacterial and anti-microbial shampoo. All of these types of shampoos include a soap or detergent and an oil, fat

Percent Percent Coconut soap potassium salt 1 35 Olive oil soft soap .W- 1'0 Biguauide No. 38 0. 5 0. 5

Percent Triethanolamine lauryl sulfate (C to C 35 Sodium alginate 2.5 Water 62.5 Biguanide No. 8 0.5 Magnesium st'earate 1 Water 37.5 Sodium lauryl sulfate (C to C 30 Polyvinyl alcohol, 10% 20.5 Methylcellulo'se, 50 cps. 9 Glyceryl monolaurate 1 Lanolin f 0.5 Biguanide No. 20 0.5 Sodium keryl benzene sulfonate 10 Sodium sulfate 6 Sodium cetyl sulfate 20 Sodium carbonate 10 Sodium bicarbonate 5 White acid clay 48.5 Biguanide No. 52 0.5

The biguanides of the invention are quite useful in shaving soaps and creams and in after-shave preparations, in order to minimize infection. A lather shavingcream' is usually a solution of soap in glycerol and water, in which excess solid soap maybedispersed. The following is a typical shaving cream preparation:

After-shave preparations generally contain alcohol and water, and may include agents to give a'cooling effect, such as menthol, an aluminum or a Zinc salt to impart astringency and styptic action, and humectants such as glycerol, propylene glycol and sorbitol to impart emolliency. The biguanide of the invention is a typical aftershave lotion:

The biguanides of the invention are particularly advantageously employed in lotions for use in the eye because of their elfectiveness against fungi, bacteria and viruses. The biguanides of the invention also protect the human eye against infection.

Lotions for use in the eye must be clear, non-irritating, sterile solutions having a pH of 7.2 to 7.4, isotonic with the lachrymal fluid, and containing an effective preservative. Materials used in such lotions include preservatives, which function is served in the case of the lotions of the invention by the biguanide, boric acid, used as a non-irritating antiseptic and soothing agent, sodium chloride, sodium borate, potassium bicarbonate, potassium carbonate, sodium citrate, glycerol, methylcellulose to effect isotonicity or buffering action, zinc sulfate, used as a mild astringent, antipyrine, hydrastine hydrochloride, and berberine hydrochloride, used for local decongestant action, and aromatic waters. Typical lotions are as follows:

BOric Mid 1.50 1.00 g. Sodium borate, decahydrate 0.25 g 0.17 g. Sodium chloride 0.25 g. Phenyl ethyl alcohol 0.5 g.. 0.50 g. Antipyrlne 0.25 g.

Rose water 5.0 cc. to made 0.0 cc.

Distilled water, to made 100.0 cc Biguanide No. 7 0.5% 0.5%.

Ointments for use in the eye can also be prepared, incorporating the biguanides of the invention and conventional ointment bases, as described heretofore.

Antiperspirants and deodorants are standard cosmetic base formulation including an active antiperspirant or deodorant ingredient. Antiperspirants are usually substances having an astringent action, including salts of aluminum, iron, chromium, lead, mercury, zinc and zirconium. The sulfates, chlorides, chlorohydroxides, phenyl sulfates, formates, lactates, sulfonates and alums are generally used. Skin irritation is minimized by the addition of small amounts of zinc oxide, magnesium oxide, aluminum hydroxide, or triethanolamine. These ingredients are formulated as liquid antiperspirants, generally applied as a spray or from an applicator container, antiperspirant creams, which are usually based on a vanishing cream-type base, and lotions, which are really a considerably diluted cream, as well as antiperspirant sticks, a lotion or cream, jellied by addition of a hard wax or soap such as sodium 32 Part A: Percent Stearic acid 14 Beeswax 2 Mineral oil l Span 60 5 Tween 60 5 Part B:

Water 52 Aluminum chlorohydroxide 20 Perfume q.s. Biguanide No. 103 1.0

Glyceryl monostearate 5 Polyethylene glycol 1000 monostearate 3 Polyethylene glycol 400 5 Water 65.5 E-607 Special 5 Aluminum chlorohydroxide l5 Perfume q.s. Biguanide No. 64 1.5

Deodorants do not include an astringent agent, but instead employ a deodorant, such as zinc oxide or peroxide, boric acid, and benzilic acid. The formulation is otherwise similar to an antiperspirant.

Any of the above described cosmetic preparations can be formulated as an aerosol by incorporation of a propellant and a suflicient amount of solvent or dispersing agent to form a sprayable liquid. The propellant may itself serve as a solvent or diluent. Fluorinated hydrocarbons, chlorinated hydrocarbons, and non-halogenated hydrocarbons are the usual propellants, as is well known to those skilled in this art. Special types of pressurized containers are employed in packaging such compositions, and these also are well known and are described in the patent literature.

The above described compositions are all means for bringing the biguanides of the invention into contact with microbes to exert their antimicrobial action thereon. Many other types of compositions will be apparent to those skilled in this art.

The biguanides of this invention are useful intermediates in the preparation of other chemicals. They can, for example, be converted to dihydrotriazines of the following type, as exemplified by conversion of Compound 17:

Also, these biguanides can be converted to triazines of the following structure, by reaction with esters (R COOC H or acid chlorides (R COCI):

See, for example, Shapiro et al., J. Am. Chem. Soc. 79: 5064 (1957); ibid: 81, 3996 (1959), J. Org. Chem. 25: 379, 384 (1960) J. Am. Pharm. Assn (Sci. Ed.) 49: 737

wherein at least one of R and R and at least one of R and R are selected from the group consisting of haloaralkyl and aralkyl groups and at least one of R R R and R is a haloaralkyl group, the haloaralkyl and aralkyl groups having from about seven to about eighteen carbon atoms and from one to three halogen atoms, the remaining R radicals being selected from the group consisting of hydrogen and organic radicals having from one to about six carbon atoms, selected from the group consisting of alkyl, alkenyl and cycolalkyl radicals.

2. A monobiguanide in accordance with claim 1 having a haloaralkyl group attached to each terminal nitrogen atom.

3. A monobiguanide in accordance with claim 1 having a haloaralkyl group attached to one terminal nitrogen atom, and an aralkyl group attached to the other terminal nitrogen atom.

4. A monobiguanide in accordance with claim 1 in which the haloaralkyl group is a halobenzyl group.

5. A monobiguanide in accordance with claim 1 in which the haloaralkyl group is a chlorobenzyl group.

6. A monobiguanide in accordance with claim 1 in which the haloaralkyl group is a dichlorobenzyl group.

7. A monobiguanide in accordance with claim 1 in which the aralkyl group is a benzyl group.

8. A monobiguanide in accordance with claim 1 in which the aralkyl group is an alpha-phenyl-beta-phenethyl group.

9. A monobiguanide in accordance with claim 1 wherein each haloaralkyl group is a halophenylalkyl group and each aralkyl group is a phenylalkyl group.

10. N (3,4-dich1orobenzyl)-N -(3,4-dichlorobenzyl)- biguanide.

13. N (4-chlorobenzyl)-N -methy1-N -(2,4-dichlorobenzyl) -biguanide.

14. N -(alpha-phenyl-beta-phenethyl) N (4chlorobenzyl) biguanide.

15. N -(4-iodo-betaphenethy1) N (4-chlorobenzyl)- biguanide.

1 6. N -(4-chlorobenzy1) N (2,4 dichlorobenzyl)- biguanide.

17. N (3,4 dimethylbenzyl) N (3,4 dichlorobenzyl)-biguanide.

18. An acid addition salt of a compound in accordance with claim 1.

References Cited in the file of this patent UNITED STATES PATENTS 2,455,896 Nagy Dec. 7, 1948 2,577,773 Cambert Dec. 11, 1951 2,658,873 Marcoux Nov. 10, 1953 2,659,755 Harman Nov. 17, 1953 2,784,807 Chenicek et a1 Feb. 14, 1956 2,863,919 Birtwell et a1 Dec. 9, 1958 2,900,307 Wei Aug. 18, 1959 2,946,725 Norris July 26, 1960 2,953,564 Sherman Sept. 20, 1960 2,955,985 Kuna Oct. 11, 1960 2,959,616 Birtwell Nov. 8, 1960 2,961,377 Shapiro Nov. 22, 1960 2,987,436 Geary June 6, 1961 2,988,475 Gaertner June 13, 1961 2,996,432 Modde-rno Aug. 15, 1961 OTHER REFERENCES Shapiro et al., I.A.C.S., vol. 81, pages 4635-4639 (11959).

Shapiro et al., J.A.C.S., vol. 81, pages 3728-3736 (1959).

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No 3, 183, 230 May 11, 1965 Seymour L. Shapiro et a1.

It is hereby certified that error appears in the above'numbered patent requiring correction and that the said Letters Patent should read as corrected below.

Column 1, line 33,r.f.or "2,683,919" read 2,863,919 line 55, for "1957" read .1947 line 57, for "gramenegative" read gram-negative column 2, line 57, for "of" read to column 3, line 27, after "alkenyl" insert or cycloalkyl column 4 lines 21 to 23, formula (4) for the extreme left-hand portion of the formula reading CN read Cl column 5, lines 27 to 33, formula (21) for the extreme righthand portion of the formula reading read column 6, lines 25 to 27, formula [36), for the extreme lefthand portion of the formula reading CH read 3 column 10, lines 14 to 17, formula (95), for the extreme lefthand portion of the formula reading Cl read Cl same column 10, lines 58 to 61, formula (102), for the center portion ,of the formula reading -NN read -NH- column 11, lines 60 to 65, formula (114) for the extreme lefthand portion of the formula reading C1 read Cl H column 12, lines 41 to 48, formula (125), for the left-hand portlon of the formula reading c1-O-cH -r|m (11061 column 14, line 5, for "dichlorobenzylamine'read chlorobenzylamine column 15, line 26, after "Z YL" insert column 17, line 14, before "OLO'I" insert an opening parenthesis; column l8,..line 21, for "(313" read C1 columns 21 and 22, TABLE II, first column; under the heading "Biguanide Hydrochloride", line 13 thereof, for "N -(3 dimethylbenzyl)" read N (3,4-dimethylbenzyl) column 22, TABLE IV, last column, under the heading "Monllia albicans", third line from the bottom, strike out 'Do", and insert instead Slight growth at 33 same column, same table, under the heading "Biguanide hydrochloride", second line from the bottom, for "-N" read -N column 23, TABLE IV, last column, under the heading "Monilia albicans", opposite the seventh and ninth compounds from the bottom, strike out "Do", each occurrence, and insert instead Slight growth at 33 line 55, underneath the table, strike out "2,4-dichlorobenzyll'; Column 24, line 49, for "cyclosterine" read cycloserine column 28, line 55, for "strain" read stain Signed and sealed this 23rd day of November 1965. (SEAL) Attest:

ERNEST W. SWIDER EDWARD J. BRENNER Attesting Officer Commissioner of Patents 

1. A MONOBIGUANIDE HAVING THE FORMULA 